Next, we explore the large-eddy simulation database similar to the one described in [1]} (also performed using the compressible flow solver “Charles”, developed by Cascade Technologies), which comprises an overexpanded jet issuing from a round converging-diverging nozzle (design Mach number \(M_d=1.5\) ) at an ideally expanded jet Mach number \(M_j=1.35\)  and nozzle temperature ratio \(NTR=2.53\) . The main differences compared to this previous simulation are the Reynolds number (\(_j=760000\) ), the presence of wall-modelling inside the nozzle and a near-wall adaptive mesh refinement (see [2]}). The total simulation time was \(\Delta t c_\infty /D=500\) , and fields were saved at a sampling frequency of \(fD/c_\infty =10\) , resulting in 5000 snapshots. The data are interpolated onto a structured cylindrical grid with dimensions \(N_x \times N_r \times N_\theta = 698 \times 136 \times 128\) , ranging \(0 \le x/D \le 30\) , \(0 \le r/D \le 6\) , and an azimuthal decomposition is performed using \(n_{fft,\theta }=128\) . Further details about the LES simulation can be found in [1]}.
